private static void CopyDateTimeFields(
FatDirectoryEntry src, FatDirectoryEntry dst)
{
dst.SetCreated(src.GetCreated());
dst.SetLastAccessed(src.GetLastAccessed());
dst.SetLastModified(src.GetLastModified());
}
internal void Read()
{
var dataA = new byte[GetCapacity() * FatDirectoryEntry.SIZE];
var data = new MemoryStream(dataA);
Read(data);
data.SetLength(data.Position);
data.Position = 0;
for (var i = 0; i < GetCapacity(); i++)
{
var e =
FatDirectoryEntry.Read(data, IsReadOnly());
if (e == null)
{
break;
}
if (e.IsVolumeLabel())
{
if (!this.isRoot)
{
throw new IOException(
"volume label in non-root directory");
}
this.volumeLabel = e.GetVolumeLabel();
}
else
{
entries.Add(e);
}
}
}
public FatDirectoryEntry CreateSub(Fat fat)
{
var chain = new ClusterChain(fat, false);
chain.SetChainLength(1);
var entry = FatDirectoryEntry.Create(true);
entry.SetStartCluster(chain.GetStartCluster());
var dir =
new ClusterChainDirectory(chain, false);
/* add "." entry */
var dot = FatDirectoryEntry.Create(true);
dot.SetShortName(ShortName.Dot);
dot.SetStartCluster(dir.GetStorageCluster());
CopyDateTimeFields(entry, dot);
dir.AddEntry(dot);
/* add ".." entry */
var dotDot = FatDirectoryEntry.Create(true);
dotDot.SetShortName(ShortName.DotDot);
dotDot.SetStartCluster(GetStorageCluster());
CopyDateTimeFields(entry, dotDot);
dir.AddEntry(dotDot);
dir.Flush();
return(entry);
}
internal FatLfnDirectoryEntry(FatLfnDirectory parent,
FatDirectoryEntry realEntry, string fileName) : base(parent.IsReadOnly())
{
this.parent = parent;
this.RealEntry = realEntry;
this.fileName = fileName;
}
internal FatDirectoryEntry[] CompactForm()
{
if (RealEntry.GetShortName().Equals(ShortName.Dot) ||
RealEntry.GetShortName().Equals(ShortName.DotDot) ||
RealEntry.HasShortNameOnly)
{
/* the dot entries must not have a LFN */
return(new FatDirectoryEntry[] { RealEntry });
}
var totalEntrySize = TotalEntrySize();
var entries =
new FatDirectoryEntry[totalEntrySize];
var checkSum = RealEntry.GetShortName().CheckSum();
var j = 0;
for (var i = totalEntrySize - 2; i > 0; i--)
{
entries[i] = CreatePart(fileName.Substring(j * 13, j * 13 + 13),
j + 1, checkSum, false);
j++;
}
entries[0] = CreatePart(fileName.Substring(j * 13),
j + 1, checkSum, true);
entries[totalEntrySize - 1] = RealEntry;
return(entries);
}
public void RemoveEntry(FatDirectoryEntry entry)
{
if (entry == null)
{
throw new Exception();
}
entries.Remove(entry);
ChangeSize(GetSize());
}
internal FatFile GetFile(FatDirectoryEntry entry)
{
entryToFile.TryGetValue(entry, out var file);
if (file == null)
{
file = FatFile.Get(fat, entry);
entryToFile.Add(entry, file);
}
return(file);
}
internal FatLfnDirectoryEntry(string name, ShortName sn, FatLfnDirectory parent, bool directory) : base(false)
{
this.parent = parent;
fileName = name;
var now = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds;
RealEntry = FatDirectoryEntry.Create(directory);
RealEntry.SetShortName(sn);
RealEntry.SetCreated(now);
RealEntry.SetLastAccessed(now);
}
internal FatLfnDirectory GetDirectory(FatDirectoryEntry entry)
{
entryToDirectory.TryGetValue(entry, out var result);
if (result == null)
{
var storage = Read(entry, fat);
result = new FatLfnDirectory(storage, fat, IsReadOnly());
entryToDirectory.Add(entry, result);
}
return(result);
}
public static FatDirectoryEntry CreateVolumeLabel(string volumeLabel)
{
var data = new byte[SIZE];
Array.Copy(
Encoding.ASCII.GetBytes(volumeLabel), 0,
data, 0,
volumeLabel.Length);
var result = new FatDirectoryEntry(data, false);
result.SetFlags(F_VOLUME_ID);
return(result);
}
public void AddEntry(FatDirectoryEntry e)
{
if (e == null)
{
throw new Exception();
}
if (GetSize() == GetCapacity())
{
ChangeSize(GetCapacity() + 1);
}
entries.Add(e);
}
private static ClusterChainDirectory Read(FatDirectoryEntry entry, Fat fat)
{
if (!entry.IsDirectory())
{
throw
new ArgumentException(entry + " is no directory");
}
var chain = new ClusterChain(
fat, entry.GetStartCluster(),
entry.IsReadonlyFlag());
var result =
new ClusterChainDirectory(chain, false);
result.Read();
return(result);
}
internal static FatFile Get(Fat fat, FatDirectoryEntry entry)
{
if (entry.IsDirectory())
{
throw new ArgumentException(entry + " is a directory");
}
var cc = new ClusterChain(
fat, entry.GetStartCluster(), entry.IsReadonlyFlag());
if (entry.GetLength() > cc.GetLengthOnDisk())
{
throw new IOException(
"entry is larger than associated cluster chain");
}
return(new FatFile(entry, cc));
}
public static FatDirectoryEntry Create(bool directory)
{
var result = new FatDirectoryEntry();
if (directory)
{
result.SetFlags(F_DIRECTORY);
}
/* initialize date and time fields */
var now = (long)(DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds;
result.SetCreated(now);
result.SetLastAccessed(now);
result.SetLastModified(now);
return(result);
}
/// <summary>
/// Flush the contents of this directory to the persistent storage
/// </summary>
public void Flush()
{
var dataA = new byte[GetCapacity() * FatDirectoryEntry.SIZE];
var data = new MemoryStream(dataA);
for (var i = 0; i < entries.Count; i++)
{
var entry = entries[i];
if (entry != null)
{
entry.Write(data);
}
}
/* TODO: the label could be placed directly the dot entries */
if (volumeLabel != null)
{
var labelEntry =
FatDirectoryEntry.CreateVolumeLabel(volumeLabel);
labelEntry.Write(data);
}
if (data.Length - data.Position > 0)
{
FatDirectoryEntry.WriteNullEntry(data);
}
data.SetLength(data.Position);
data.Position = 0;
Write(data);
ResetDirty();
}
private FatFile(FatDirectoryEntry myEntry, ClusterChain chain) : base(myEntry.IsReadOnly())
{
entry = myEntry;
this.chain = chain;
}
